Corona viruses are a wide range of viruses that may cause disease in animals and humans. It is known that a number of coronaviruses cause human respiratory diseases in severity ranging from common cold to more severe diseases such as Middle East Respiratory Syndrome (MERS) and severe acute respiratory syndrome (SARS). The newly discovered Coronavirus causes Covid-19 disease
This question brings back this thread to many others within RG dealing with the matter of livingness/non-livingness of viruses. My answer is: if its origin is definitly known, at that time its age may be estimated. If you one take the date of its appearence as the beggining, this is meaningless, since the question returns: the origin.
What is common to all viruses is their continuous and pertinent mutations.
First of all, viruses are not living beings but "simple" associations of biological molecules, the result of the self-organization of organic molecules. They only function inside cells. The RNA of an RNA virus remains stable and infectious for 30 minutes to a few hours. During this time, the RNA makes new viral proteins. Together they form new virions (viral particles) that leave the cell to find the new ones. In virions, RNA can keep infectivity for days to years. Most viruses (flu, colds) are cleared from the body after several days. However, some of them last. For example, HIV is weakened outside the body. In a person, an HIV virion stays in the blood for 5-10 minutes and in a cell for 18 hours. A small fraction of the virus population remains latent for years and thus evades the immune system.
Dear Doufnoune RACHIDA Rachida , Amina Sultan , and Saeed Mojtabazadeh ,
Thank you so much for your reply and contributions.
Dear Doufnoune RACHIDA Rachida , in my field, mechanical engineering, we can estimate the design life of various machine elements. We can also predict the remaining life time of a part by using the theory of reliability. For the first case we used the strength of material approach, whereas in the second case we used a statistical approach.
As a theoritical methods nothing. Actualy, Scientists are working to track the spread of the coronavirus in the world by using clues in its genetic code. Analysing samples collected from patients will also reveal whether the virus is mutating into new strains. Until now, there isn't a sufficient and satisfactory answer of your question!!!
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